Radio frequency transmit-receive apparatus, terminal, and method

ABSTRACT

Embodiments of the present invention provide a radio frequency transmit-receive apparatus, a terminal, and a method. The radio frequency transmit-receive apparatus according to the present invention includes: a first antenna unit, a duplexer, a radio frequency unit, and a signal selecting unit. The embodiments of the present invention can solve a problem of inflexible uplink and downlink resource configuration in a radio frequency transmit-receive apparatus in the prior art.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of International Patent ApplicationNo. PCT/CN2014/076916, filed on May 7, 2014, which claims priority toChinese Patent Application No. 201310208479.3, filed on May 30, 2013,both of which are hereby incorporated by reference in their entireties.

TECHNICAL FIELD

Embodiments of the present invention relate to radio communicationstechnologies, and in particular, to a radio frequency transmit-receiveapparatus, a terminal, and a method.

BACKGROUND

In Long Term Evolution (LTE) communications technology, duplex modes maybe classified into two types, Frequency Division Duplex (FDD) and TimeDivision Duplex (TDD). In the FDD mode, different frequencies are usedin uplink and downlink channels, and frames of fixed time lengths areused for both uplink transmission and downlink transmission. In the TDDmode, uplink transmission and downlink transmission are performed indifferent timeslots, and usually share a same frequency. Compared withFDD, TDD has characteristics of high frequency utilization and flexibleuplink and downlink resource configuration.

A Carrier Aggregation (CA) technology is a key technology in LTE, and isused to implement aggregation of carriers at two frequencies. Generally,the CA technology may be implemented by using a radio frequency circuitof a terminal. According to different aggregation modes, CA may beclassified into three types: intra-band contiguous CA, intra-bandnon-contiguous CA, and inter-band CA. Usually, the intra-band contiguousCA is applicable to a scenario of narrow frequency spacing, and a radiofrequency circuit structure thereof is simple; the intra-bandnon-contiguous CA and inter-band CA are applicable to a scenario of widefrequency spacing. Since frequency resources vary across globalcommunications markets, the CA technology is evolved with one of itsfocuses placed on promoting the capability of a radio frequency circuitto support wider frequency spacing.

In the prior art, in the TDD mode, two different bands in inter-band CAare both used to transmit uplink signals or both used to receivedownlink signals in a TDD timeslot, and consequently, the uplink anddownlink resource configurations are inflexible.

SUMMARY

Embodiments of the present invention provide a radio frequencytransmit-receive apparatus, a terminal, and a method to overcome aproblem of inflexible uplink and downlink resource configuration by aradio frequency transmit-receive apparatus in the prior art.

According to a first aspect, an embodiment of the present inventionprovides a radio frequency transmit-receive apparatus, including: afirst antenna unit, configured to receive a first carrier aggregationsignal, and input the first carrier aggregation signal to a duplexer;

the duplexer, configured to receive the first carrier aggregation signalinput by the first antenna unit, and after dividing the first carrieraggregation signal into at least one first carrier signal, input eachfirst carrier signal to a signal selecting unit corresponding to afrequency;

the signal selecting unit, configured to select to receive, in a timedivision duplex TDD timeslot, the at least one first carrier signalinput by the duplexer, and input the at least one first carrier signalto a radio frequency unit; and

the radio frequency unit, configured to receive the at least one firstcarrier signal sent by the signal selecting unit, and demodulate each ofthe at least one first carrier signal into a first analog basebandsignal;

the radio frequency unit is further configured to modulate a secondanalog baseband signal into at least one second carrier signal, and sendthe at least one second carrier signal to the signal selecting unitcorresponding to the frequency; the signal selecting unit is furtherconfigured to select to receive, in the TDD timeslot, the at least onesecond carrier signal sent by the radio frequency unit, and send the atleast one second carrier signal to the duplexer; the duplexer is furtherconfigured to receive the at least one second carrier signal input bythe signal selecting unit, combine the at least one second carriersignal to obtain a second carrier aggregation signal, and input thesecond carrier aggregation signal to the first antenna unit; and thefirst antenna unit is further configured to receive the second carrieraggregation signal sent by the duplexer, and transmit the second carrieraggregation signal.

In a first possible implementation of the first aspect, the apparatusfurther includes:

a controlling unit, configured to control, in the TDD timeslot accordingto a set ratio of uplink signal resources to downlink signal resources,the signal selecting unit to select to receive the at least one firstcarrier signal input by the duplexer and input the at least one firstcarrier signal to the radio frequency unit; or control the signalselecting unit to select to receive the at least one second carriersignal sent by the radio frequency unit and send the at least one secondcarrier signal to the duplexer.

According to the first possible implementation of the first aspect, in asecond possible implementation, the signal selecting unit includesmultiple signal selecting subunits, the radio frequency unit includesmultiple radio frequency subunits, and each signal selecting subunitcorresponds to one radio frequency subunit; and

each signal selecting subunit is configured to select to receive, in theTDD timeslot, one of the at least one first carrier signal input by theduplexer, and input one of the at least one first carrier signal to acorresponding radio frequency subunit; and further configured to selectto receive, in the TDD timeslot, one of the at least one second carriersignal sent by the corresponding radio frequency subunit, and send oneof the at least one second carrier signal to the duplexer.

According to the second possible implementation of the first aspect, ina third possible implementation, the controlling unit is specificallyconfigured to:

control, in the TDD timeslot according to the set ratio of uplink signalresources to downlink signal resources, a part of the multiple signalselecting subunits to select to receive the at least one first carriersignal input by the duplexer and input the at least one first carriersignal to the radio frequency unit, and control a part of the multiplesignal selecting subunits to select to receive the at least one secondcarrier signal sent by the radio frequency unit and send the at leastone second carrier signal to the duplexer.

According to the first aspect or any one of the first to third possibleimplementations of the first aspect, in a fourth possibleimplementation, the apparatus further includes a second antenna unit andat least one surface acoustic wave filter SAW unit, where:

the second antenna unit is configured to receive a third carrieraggregation signal, and input the third carrier aggregation signal tothe at least one SAW unit;

the at least one SAW unit is configured to receive the third carrieraggregation signal input by the second antenna unit, and after dividingthe third carrier aggregation signal into at least one third carriersignal, input the at least one third carrier signal to the radiofrequency unit; and

the radio frequency unit is further configured to receive the at leastone third carrier signal input by the at least one SAW unit, anddemodulate each of the at least one third carrier signal into a thirdanalog baseband signal.

According to any one of the second to fourth possible implementations ofthe first aspect, in a fifth possible implementation, each signalselecting subunit further corresponds to a differential component; and

each differential component is configured to receive one of the at leastone first carrier signal input by a corresponding signal selectingsubunit, and after converting one of the at least one first carriersignal into a differential signal, input the differential signal to acorresponding radio frequency subunit.

According to any one of the second to fifth possible implementation ofthe first aspect, in a sixth possible implementation, each signalselecting subunit further corresponds to a power amplifier; and

each power amplifier is configured to receive one of the at least onesecond carrier signal input by the radio frequency unit, and afterperforming power amplification for one of the at least one secondcarrier signal, input one of the at least one second carrier signal to acorresponding signal selecting subunit.

According to the first aspect or any one of the first to sixth possibleimplementation of the first aspect, in a seventh possibleimplementation, the apparatus further includes a first single-poleN-throw (SPNT) switch, where the first SPNT switch is disposed betweenthe first antenna unit and the duplexer, and configured to receive thefirst carrier aggregation signal sent by the first antenna unit, andinput the first carrier aggregation signal to the duplexer; and furtherconfigured to receive the second carrier aggregation signal sent by theduplexer, and input the second carrier aggregation signal to the firstantenna unit.

According to any one of the fourth to seventh possible implementationsof the first aspect, in an eighth possible implementation, the apparatusfurther includes a second SPNT switch, where the second SPNT switch isdisposed between the second antenna unit and the at least one SAW unit,and configured to receive the third carrier aggregation signal sent bythe second antenna unit, and input the third carrier aggregation signalto the at least one SAW unit.

According to the first aspect or any one of the first to eighth possibleimplementations of the first aspect, in a ninth possible implementation,the duplexer is further configured to filter out a noise signal in theat least one second carrier signal and first carrier signal.

According to a second aspect, an embodiment of the present inventionprovides a terminal, including a baseband processor, and furtherincluding the radio frequency transmit-receive apparatus according toany embodiment of the present invention;

the radio frequency transmit-receive apparatus is configured to receivea first carrier aggregation signal, and after converting the firstcarrier aggregation signal into a first analog baseband signal, send thefirst analog baseband signal to the baseband processor; the basebandprocessor is configured to process the first analog baseband signal;

the baseband processor is further configured to generate a second analogbaseband signal, and send the second analog baseband signal to the radiofrequency transmit-receive apparatus; and the radio frequencytransmit-receive apparatus is further configured to convert the secondanalog baseband signal into a second carrier aggregation signal fortransmission.

According to a third aspect, an embodiment of the present inventionprovides a radio frequency transmit-receive method, including: selectingto receive, in a time division duplex TDD timeslot, a first carriersignal input by a duplexer, where the first carrier signal is obtainedby the duplexer by dividing a first carrier aggregation signal input bya first antenna unit; and inputting the first carrier signal to a radiofrequency unit, so that the radio frequency unit demodulates the firstcarrier signal into a first analog baseband signal; and selecting toreceive, in the TDD timeslot, at least one second carrier signal sent bythe radio frequency unit, and sending the at least one second carriersignal to the duplexer, so that the duplexer combines the at least onesecond carrier signal to obtain a second carrier aggregation signal andthe first antenna unit transmits the second carrier aggregation signal.

In a first possible implementation of the third aspect, the selecting toreceive, in a time division duplex TDD timeslot, a first carrier signalinput by a duplexer, includes: selecting to receive, in the TDD timeslotaccording to a set ratio of uplink signal resources to downlink signalresources, the first carrier signal input by the duplexer; and theselecting to receive, in the TDD timeslot, at least one second carriersignal sent by the radio frequency unit, includes: selecting to receive,in the TDD timeslot according to the set ratio of uplink signalresources to downlink signal resources, the at least one second carriersignal sent by the radio frequency unit.

In the radio frequency transmit-receive apparatus, the terminal, and themethod provided by the embodiments of the present invention, a duplexer,a signal selecting unit, and a radio frequency unit are used toconstitute a signal transmission channel that may be used for bothuplink transmission and downlink reception. The signal selecting unitmay select to receive, in a TDD timeslot, a downlink first carriersignal, and may further select to transmit, in the TDD timeslot, anuplink second carrier signal, thereby achieving an objective of using afrequency band of the first carrier signal for downlink reception andusing a frequency band of the second carrier signal for uplinktransmission, implementing flexible configurations of uplink anddownlink resources.

BRIEF DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of the presentinvention or in the prior art more clearly, the following brieflyintroduces the accompanying drawings required for describing theembodiments or the prior art. Apparently, the accompanying drawings inthe following description show some embodiments of the presentinvention, and persons of ordinary skill in the art may still deriveother drawings from these accompanying drawings without creativeefforts.

FIG. 1 is a typical schematic structural diagram of a circuit system ofa terminal;

FIG. 2 is a schematic structural diagram of Embodiment 1 of a radiofrequency transmit-receive apparatus according to the present invention;

FIG. 3 is a schematic structural diagram of Embodiment 2 of a radiofrequency transmit-receive apparatus according to the present invention;

FIG. 4 is a schematic structural diagram of Embodiment 3 of a radiofrequency transmit-receive apparatus according to the present invention;

FIG. 5 is a schematic structural diagram of Embodiment 4 of a radiofrequency transmit-receive apparatus according to the present invention;

FIG. 6 is a schematic structural diagram of Embodiment 5 of a radiofrequency transmit-receive apparatus according to the present invention;

FIG. 7 is a schematic structural diagram of Embodiment 1 of a terminalaccording to the present invention; and

FIG. 8 is a flowchart of a radio frequency transmit-receive methodaccording to an embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

To make the objectives, technical solutions, and advantages of theembodiments of the present invention clearer, the following clearlydescribes the technical solutions in the embodiments of the presentinvention with reference to the accompanying drawings in the embodimentsof the present invention. Apparently, the described embodiments are apart rather than all of the embodiments of the present invention. Allother embodiments obtained by persons of ordinary skill in the art basedon the embodiments of the present invention without creative effortsshall fall within the protection scope of the present invention.

Technologies described in this specification may be applied to variouscommunications systems, for example, current 2G and 3G communicationssystems and a next-generation communications system, for example, aGlobal System for Mobile Communications (GSM), a Code Division MultipleAccess (CDMA) system, a Time Division Multiple Access (TDMA) system, aWideband Code Division Multiple Access (WCDMA) system, a FrequencyDivision Multiple Access (FDMA) system, an Orthogonal Frequency-DivisionMultiple Access (OFDMA system, a single-carrier FDMA (SC-FDMA) system, aGeneral Packet Radio Service (GPRS) system, a LTE system, and othercommunications systems.

FIG. 1 is a typical schematic structural diagram of a circuit system ofa terminal. As shown in FIG. 1, the circuit system of the terminal mayinclude: a memory, an application processor, a baseband processor, and aradio frequency front end. The memory stores data and instructionsrequired for running of each part of the system. The applicationprocessor runs an operating system and application programs of theterminal. The baseband processor processes baseband signals in radiocommunication. The radio frequency front end may receive a radio signalfrom a radio channel, and convert the radio signal into a basebandanalog signal, and transmit the baseband analog signal to the basebandprocessor; the radio frequency front end may further receive a basebandanalog signal from the baseband processor, convert the baseband analogsignal into a radio signal, and transmit the radio signal to a radiochannel.

A radio frequency transmit-receive apparatus provided by an embodimentof the present invention may implement radio frequency transmission andreception in all the foregoing types of communications systems, forexample, in an LTE time division duplex TDD system in a case ofinter-band carrier aggregation. The radio frequency transmit-receiveapparatus may be disposed at the radio frequency front end in FIG. 1.

FIG. 2 is a schematic structural diagram of Embodiment 1 of a radiofrequency transmit-receive apparatus according to the present invention.As shown in FIG. 2, a radio frequency transmit-receive apparatus 200 inthis embodiment may include: a first antenna unit 1, a duplexer 2, aradio frequency unit 3, and a signal selecting unit 4.

The first antenna unit 1 may be configured to receive a first carrieraggregation signal, and input the first carrier aggregation signal tothe duplexer 2.

The duplexer 2 may be configured to receive the first carrieraggregation signal input by the first antenna unit 1, and after dividingthe first carrier aggregation signal into at least one first carriersignal, input each first carrier signal to the signal selecting unit 4corresponding to a frequency.

The signal selecting unit 4 may be configured to select to receive, in aTDD timeslot, the at least one first carrier signal input by theduplexer 2, and input the at least one first carrier signal to the radiofrequency unit 3.

The radio frequency unit 3 may be configured to receive the at least onefirst carrier signal sent by the signal selecting unit 4, and demodulateeach of the at least one first carrier signal into a first analogbaseband signal.

The radio frequency unit 3 may be further configured to modulate asecond analog baseband signal into at least one second carrier signal,and send the at least one second carrier signal to the signal selectingunit 4 corresponding to the frequency. The signal selecting unit 4 maybe further configured to select to receive, in the TDD timeslot, the atleast one second carrier signal sent by the radio frequency unit 3, andsend the at least one second carrier signal to the duplexer 2. Theduplexer 2 may be further configured to receive the at least one secondcarrier signal input by the signal selecting unit 4, combine the atleast one second carrier signal to obtain a second carrier aggregationsignal, and input the second carrier aggregation signal to the firstantenna unit 1. The first antenna unit 1 may be further configured toreceive the second carrier aggregation signal sent by the duplexer 2,and transmit the second carrier aggregation signal.

Each first carrier signal is a downlink signal, and each second carriersignal is an uplink signal. The radio frequency unit 3 may be configuredto demodulate first carrier signals of multiple frequency bands, and mayalso be configured to generate second carrier signals of multiplefrequency bands. In the example of FIG. 2, there are two first carriersignals RX1 and RX2 and two second carrier signals TX1 and TX2. In aspecific implementation, the signal selecting unit 4 may, in a TDDtimeslot, select to receive two downlink first carrier signals, or mayselect to transmit two uplink second carrier signals, and may furtherselect to receive one first carrier signal and transmit one secondcarrier signal.

In the radio frequency transmit-receive apparatus in this embodiment, aduplexer, a signal selecting unit, and a radio frequency unit are usedto constitute a signal transmission channel that may be used for bothuplink transmission and downlink reception. The signal selecting unitmay select to receive, in a TDD timeslot, a downlink first carriersignal, and may further select to transmit, in the TDD timeslot, anuplink second carrier signal, thereby achieving an objective of using afrequency band of the first carrier signal for downlink reception andusing a frequency band of the second carrier signal for uplinktransmission in one TDD timeslot, implementing flexible configurationsof uplink and downlink resources.

FIG. 3 is a schematic structural diagram of Embodiment 2 of a radiofrequency transmit-receive apparatus according to the present invention.As shown in FIG. 3, a radio frequency transmit-receive apparatus 300 inthis embodiment is based on the embodiment shown in FIG. 2; in thisembodiment, the signal selecting unit 4 may include multiple signalselecting subunits 41, the radio frequency unit 3 may include multipleradio frequency subunits 31, and each signal selecting subunit 41corresponds to one radio frequency subunit 31, that is, each signalselecting subunit 41 corresponds to a carrier signal of one frequency.

Each signal selecting subunit 41 may be configured to select to receive,in a TDD timeslot, one of the at least one first carrier signal input bythe duplexer 2, and input one of the at least one first carrier signalto a corresponding radio frequency subunit 31; and further configured toselect to receive, in the TDD timeslot, one of the at least one secondcarrier signal sent by a corresponding radio frequency subunit 31, andsend one of the at least one second carrier signal to the duplexer 2.

In a specific implementation, if a first carrier aggregation signalincludes a signal of only one frequency, a signal output by the duplexer2 is a first carrier signal, that is, the first carrier aggregationsignal; if there is only one second carrier signal, a signal outputafter the second carrier signal is combined by the duplexer 2 is asecond carrier aggregation signal, that is, the second carrieraggregation signal and the second carrier signal are a same signal.

In the example of the radio frequency transmit-receive apparatus in thisembodiment, the signal selecting unit 4 includes two signal selectingsubunits 41 and the radio frequency unit 3 includes two radio frequencysubunits 31. Each radio frequency subunit 31 may be configured toprovide a carrier signal of one frequency band. In a same TDD timeslot,each radio frequency subunit 31 may generate an uplink carrier signal ofone frequency or process a downlink carrier signal. Carrier signalsprocessed by the radio frequency subunits 31 may be carrier signals ofdifferent frequency bands. It is understandable that, in the signalselecting unit 4 in the radio frequency transmit-receive apparatusprovided by this embodiment of the present invention, three or more thanthree signal selecting subunits 41 may be disposed to implementreception or transmission of carrier aggregation signals at three ormore than three frequencies.

The duplexer 2 may combine multiple carrier signals of differentfrequencies into one signal, and may also divide one signal, which isobtained by aggregating carrier signals of multiple frequencies, intomultiple single-carrier signals. Therefore, by using the radio frequencytransmit-receive apparatus in this embodiment, multiple uplink anddownlink signal transmission channels are allowed, and the signalselecting unit 4 may be used to control whether to use the uplink signaltransmission channels or the downlink signal transmission channels.

To make the description clearer, a radio frequency unit 3 disposed inthe following manner is used as an example for description. In a sameTDD timeslot, one radio frequency subunit 31 may provide an uplinkcarrier signal TX1, or may process a downlink carrier signal RX1;another radio frequency subunit 31 may generate an uplink carrier signalTX2, or may process a downlink carrier signal RX2. Furthermore, theuplink carrier signal TX1 generated by the one radio frequency subunit31 and the uplink carrier signal TX2 generated by the another radiofrequency subunit 31 are carrier signals of different frequency bands,and the downlink carrier signal RX1 processed by the one radio frequencysubunit 31 and the downlink carrier signal RX2 processed by the anotherradio frequency subunit 31 are carrier signals of different frequencybands. However, usually, the uplink carrier signal TX1 generated by theradio frequency subunit 31 and the downlink carrier signal RX1 that maybe processed by the radio frequency subunit 31 are carrier signals of asame frequency band, and for ease of description, the two signals arerespectively named the uplink carrier signal TX1 of a first frequencyband and the downlink carrier signal RX1 of the first frequency band;the uplink carrier signal TX2 generated by the another radio frequencysubunit 31 and the downlink carrier signal RX2 that may be processed bythe another radio frequency subunit 31 may also be carrier signals of asame frequency band, and for ease of description, the two signals arerespectively named the uplink carrier signal TX2 of a second frequencyband and the downlink carrier signal RX2 of the second frequency band.

The duplexer 2 may be a duplexer configured to combine two signals intoone signal or divide one signal into two signals.

Correspondingly, the number of signal selecting subunits 41 may also beset to two, so that each signal selecting subunit may collaborate withone radio frequency subunit 31. In this design, the radio frequencytransmit-receive apparatus in this embodiment may implement four signaltransmission channels, namely, two uplink signal channels and twodownlink signal channels. The one radio frequency subunit 31, one signalselecting subunit 41, the duplexer 2, and the antenna unit 1 constitutea first uplink channel and a first downlink channel, which arerespectively used to transmit the uplink carrier signal TX1 of the firstfrequency band and the downlink carrier signal RX1 of the firstfrequency band. The another radio frequency subunit 31, another signalselecting subunit 41, the duplexer 2, and the antenna unit 1 constitutea second uplink channel and a second downlink channel, which arerespectively used to transmit the uplink carrier signal TX2 of thesecond frequency band and the downlink carrier signal RX2 of the secondfrequency band. Each signal selecting subunit 41 may be a single-poledouble-throw switch. In a same TDD timeslot, the one SPNT switch isconfigured to select the first uplink channel or the first downlinkchannel to be in a working state, and the other single-pole double-throwswitch is configured to select the second uplink channel or the seconddownlink channel to be in a working state.

Specifically, a process of transmitting the downlink carrier signal RX1of the first frequency band on the first downlink channel may be asfollows:

the duplexer 2 may be in a working mode of one single-end signal inputand two single-end signal outputs, or the duplexer 2 may be in a workingmode of an input and output at one end in a case of one signal and onesignal output and one signal input at one end in a case of two signals.Therefore, the first antenna unit 1 receives a first carrier aggregationsignal, and after the first carrier aggregation signal passes throughthe duplexer 2, a first carrier signal is obtained, where the firstcarrier signal is the downlink carrier signal RX1 of the first frequencyband, and the first carrier signal is sent to a signal selecting subunit41 corresponding to the first frequency band. The signal selectingsubunit 41 corresponding to the RX1 is set to work in a downlink channelstate, and inputs the first carrier signal, that is, the downlinkcarrier signal RX1 of the first frequency band, to a radio frequencysubunit 31 that can process the signal of the first frequency band.

A process of transmitting the uplink carrier signal TX1 of the firstfrequency band on the first uplink channel may be as follows:

the duplexer 2 may be in a working mode of one single-end signal outputand two single-end signal inputs, or the duplexer 2 may be in a workingmode of an input and output at one end in a case of one signal and onesignal output and one signal input at one end in a case of two signals;and the signal selecting unit 4 corresponding to the first frequencyband is set to work in an uplink channel state. A radio frequencysubunit 31 that can generate the uplink carrier signal TX1 of the firstfrequency band sends the generated uplink carrier signal TX1 of thefirst frequency band as a second carrier signal to the signal selectingsubunit 41 corresponding to the first frequency band. The signalselecting subunit 41 corresponding to the first frequency band thensends the second carrier signal, that is, the uplink carrier signal TX2of the first frequency band, to an input port among two signal inputports of the duplexer 2, and the second carrier signal is output to thefirst antenna unit 1 from an output end of the duplexer 2.

A process of transmitting the downlink carrier signal RX2 of the secondfrequency band on the second downlink channel may be as follows:

the duplexer 2 may be set to a working mode of one single-end signalinput and two single-end signal outputs, or the duplexer 2 may be set toa working mode of an input and output at one end in a case of one signaland one signal output and one signal input at one end in a case of twosignals. The first antenna unit 1 receives a radio frequency aggregationsignal. After the radio frequency aggregation signal passes through theduplexer 2, a first carrier signal, that is, the downlink carrier signalRX2 of the second frequency band is obtained, and the first carriersignal is sent to a signal selecting subunit 41 corresponding to thesecond frequency band. The signal selecting subunit 41 corresponding tothe second frequency band is set to work in a downlink channel state,and inputs the first carrier signal to a radio frequency subunit 31 thatcan process the downlink carrier signal RX2 of the second frequencyband.

A process of transmitting the uplink carrier signal TX2 of the secondfrequency band on the second uplink channel may be as follows:

the duplexer 2 may be set to a working mode of one single-end signaloutput and two single-end signal inputs, or the duplexer 2 may be set toa working mode of an input and output at one end in a case of one signaland one signal output and one signal input at one end in a case of twosignals; and a signal selecting subunit 41 corresponding to the TX2 isset to work in an uplink channel state. A radio frequency subunit 31that can generate the uplink carrier signal TX2 of the second frequencyband sends the generated uplink carrier signal TX2 of the secondfrequency band as a second carrier signal to the signal selectingsubunit 41 corresponding to the second frequency band. The signalselecting subunit 41 corresponding to the second frequency band thensends the second carrier signal to an input port among the two signalinput ports of the duplexer 2, and the second carrier signal is outputto the first antenna unit 1 from an output end of the duplexer 2.

The four signal transmission channels in this embodiment may be combinedflexibly. In a same TDD timeslot, either one of the first downlinkchannel and the first uplink channel may be selected as a working signaltransmission channel, and either one of the second downlink channel andthe second uplink channel may be selected as a working signaltransmission channel That is, in a same TDD timeslot, the four signaltransmission channels may be combined into the following four workingmodes: the first downlink channel and the second downlink channel (bothused to transmit a first carrier aggregation signal and two firstcarrier signals), the first uplink channel and the second uplink channel(both used to transmit two second carrier signals and a second carrieraggregation signal), the first downlink channel and the second uplinkchannel (used to transmit a first carrier aggregation signal, a secondcarrier aggregation signal, a first carrier signal, and a second carriersignal), and the first uplink channel and the second downlink channel(used to transmit a first carrier aggregation signal, a second carrieraggregation signal, a first carrier signal, and a second carriersignal).

In this embodiment, by using the foregoing signal transmission channelsthat can be combined flexibly, signals of multiple different frequencybands may all be used for downlink reception or may all be used uplinktransmission, or signals of any frequency band therein are used foruplink transmission, and signals of other frequency bands are used fordownlink reception. Thereby, uplink and downlink resources may beconfigured flexibly.

FIG. 4 is a schematic structural diagram of Embodiment 3 of a radiofrequency transmit-receive apparatus according to the present invention.As shown in FIG. 4, a radio frequency transmit-receive apparatus 400 inthis embodiment, which is based on the embodiment of the radio frequencytransmit-receive apparatus shown in FIG. 3, may further include:

a controlling unit 5, where the controlling unit 5 may be configured tocontrol, in a TDD timeslot according to a set ratio of uplink signalresources to downlink signal resources, a part of the multiple signalselecting subunits 41 of the signal selecting unit 4 to select toreceive the at least one first carrier signal input by the duplexer 2and input the at least one first carrier signal to the radio frequencyunit 3; or control a part of the multiple signal selecting subunits 41of the signal selecting unit 4 to select to receive the at least onesecond carrier signal sent by the radio frequency unit 3 and send the atleast one second carrier signal to the duplexer 2.

In a feasible implementation, the controlling unit 5 may be furtherconfigured to control, in a TDD timeslot, all the signal selectingsubunits 41 to select to receive the at least one first carrier signalinput by the duplexer 2 and input the at least one first carrier signalto the radio frequency unit 3, or control all the signal selectingsubunits 41 to select to receive the at least one second carrier signalsent by the radio frequency unit 3 and send the at least one secondcarrier signal to the duplexer 2.

That is, the apparatus in this embodiment may be set to use, in a TDDtimeslot, all the signal transmission channels for uplink transmissionor downlink reception, or may be set to use, in a TDD timeslot, a partof the signal transmission channels for uplink transmission and a partof the signal transmission channels for downlink reception.

In an actual application, the controlling unit 5 may be furtherconfigured to configure the radio frequency unit 3, so that the radiofrequency unit 3 enables, according to the set ratio of uplink signalresources to downlink signal resources, each radio frequency subunit 31to work in a corresponding frequency band.

In a specific implementation, the controlling unit 5 may be integratedinto the baseband processor shown in FIG. 1.

In this embodiment, there are four signal transmission channels same asthose in the embodiment shown in FIG. 3, and the controlling unit 5controls the signal selecting unit 4, to make it flexible and convenientto perform uplink and downlink resource configuration. A working processof the radio frequency transmit-receive apparatus in this embodimentwill be described in detail, based on the example in which the radiofrequency unit 3 includes two radio frequency subunits 31 respectivelycorresponding to two frequency bands and the signal selecting unit 4includes two signal selecting subunits 41 respectively corresponding totwo frequency bands.

For example, to meet a 1:1 ratio of uplink to downlink resources, twoTDD timeslots may be used as a transmission and reception period. Animplementation method is as follows:

In a first TDD timeslot, the controlling unit 5 may be used to controlthe two signal selecting subunits 41 to work in an uplink channel state,that is, the first TDD timeslot is used as two uplink resources. Aspecific working process is as follows: The two radio frequency subunits31 respectively modulate two second analog baseband signals into twosecond carrier signals TX1 and TX2, and respectively send the two secondcarrier signals to the two signal selecting subunits 41 of correspondingfrequencies; the two signal selecting subunits 41 select to receive thetwo second carrier signals TX1 and TX2 sent by the two radio frequencysubunits 31, and send the two second carrier signals TX1 and TX2 to theduplexer 2; the duplexer 2 receives the two second carrier signals TX1and TX2 input by the two signal selecting subunits 41, combines the twosecond carrier signals TX1 and TX2 to obtain a second carrieraggregation signal TX1+TX2, and inputs the second carrier aggregationsignal to the first antenna unit 1, and the first antenna unit 1transmits the second carrier aggregation signal to a radio channel.

In a second TDD timeslot, the controlling unit 5 may be used to controlthe two signal selecting subunits 41 to work in a downlink channelstate, that is, the second TDD timeslot is used as two downlinkresources. A specific working process is as follows: The first antennaunit 1 receives a first carrier aggregation signal RX1+RX2, and inputsthe first carrier aggregation signal to the duplexer 2; the duplexer 2receives the first carrier aggregation signal input by the first antennaunit 1, and after dividing the first carrier aggregation signal into twofirst carrier signals RX1 and RX2 of different frequencies, inputs thecarrier signals RX1 and RX2 to the two signal selecting subunits 41 ofcorresponding frequencies; the two signal selecting subunits 41 selectto respectively receive the two first carrier signals RX1 and RX2 inputby the duplexer 2, and respectively input the two first carrier signalsRX1 and RX2 to the two radio frequency subunits 31 of the correspondingfrequencies; and the two radio frequency subunits 31 respectivelyreceive the two first carrier signals RX1 and RX2 of the correspondingfrequencies, and respectively demodulate the two first carrier signalsRX1 and RX2 into two first analog baseband signals.

In this way, the 1:1 ratio of uplink to downlink resources is met. In aspecific implementation, the first TDD timeslot may also be used as twodownlink resources, and the second TDD timeslot may also be used as twouplink resources; or more timeslots may be used as a transmission andreception period; for example, four TDD timeslots are used as atransmission and reception period, and the first two TDD timeslots areused as downlink resources, and the last two TDD timeslots are used asuplink resources; or each TDD timeslot may be used as an uplink resourceand a downlink resource, and so on. The present invention sets nolimitation thereto.

For another example, to meet a 1:3 ratio of uplink to downlinkresources, two TDD timeslots may still be used as a transmission andreception period. An implementation method is as follows:

In a first TDD timeslot, the controlling unit 5 may be used to controlone of the signal selecting subunits 41 to work in an uplink channelstate, and control the other signal selecting subunit 41 to work in adownlink channel state, that is, the first TDD timeslot is used as anuplink resource and a downlink resource. A specific working process isas follows:

A radio frequency subunit 31 corresponding to the signal selectingsubunit 41 that works in the uplink channel modulates a second analogbaseband signal into a second carrier signal TX1, and sends the secondcarrier signal TX1 to a signal selecting subunit 41 corresponding to afrequency; the signal selecting subunit 41 selects to receive the secondcarrier signal TX1 sent by the radio frequency subunit 31, and sends thesecond carrier signal TX1 to the duplexer 2; and the duplexer 2 receivesthe second carrier signal TX1, and inputs the second carrier signal TX1to the first antenna unit 1, and the first antenna unit 1 transmits thesecond carrier signal TX1 to a radio channel.

The first antenna unit 1 receives a radio frequency signal RX2, andinputs the radio frequency signal RX2 to the duplexer 2; the duplexer 2inputs the radio frequency signal RX2 to a signal selecting subunit 41that corresponds to a frequency and works in the downlink channel; thesignal selecting subunit 41 selects to receive the radio frequencysignal RX2 input by the duplexer 2, and inputs the radio frequencysignal RX2 to a radio frequency subunit 31 corresponding to a frequency;and the radio frequency subunit 31 demodulates the radio frequencysignal RX2 into a first analog baseband signal.

In this way, an uplink resource and a downlink resource are included inthe first TDD timeslot.

In a second TDD timeslot, the controlling unit 5 may be used to controlthe two signal selecting subunits 41 to work in a downlink channelstate, that is, the second TDD timeslot is used as two downlinkresources. A specific working process is as follows: The first antennaunit 1 receives a first carrier aggregation signal RX1+RX2, and inputsthe first carrier aggregation signal to the duplexer 2; the duplexer 2receives the first carrier aggregation signal input by the first antennaunit 1, and after dividing the first carrier aggregation signal into twofirst carrier signals RX1 and RX2 of different frequencies, inputs thecarrier signals to the two signal selecting subunits 41 of correspondingfrequencies; the two signal selecting subunits 41 select to respectivelyreceive the two first carrier signals RX1 and RX2 input by the duplexer2, and respectively input the two first carrier signals RX1 and RX2 tothe two radio frequency subunits 31 of the corresponding frequencies;and the two radio frequency subunits 31 respectively receive the twofirst carrier signals RX1 and RX2 of the corresponding frequencies, andrespectively demodulate the two first carrier signals RX1 and RX2 intotwo first analog baseband signals.

In this way, two downlink resources are included in the second TDDtimeslot.

One uplink resource and three downlink resources are included in the twoTDD timeslots, that is, the 1:3 ratio of uplink to downlink resources ismet.

By analogy, by using the controlling unit 5 to control the signalselecting unit, a ratio of uplink signal resources to downlink signalresources in each timeslot may be set, and by using a combination ofmultiple timeslots, the radio frequency transmit-receive apparatusaccording to the present invention may realize any ratio of uplink todownlink resources.

Further, in the foregoing embodiment, the duplexer 2 may be furtherconfigured to filter out noise signals outside the bands in which the atleast one second carrier signal and first carrier signal are located.Specifically, when combining the two input second carrier signals intoone second carrier aggregation signal for outputting, the duplexer 2further filters spurious noise signals outside the bands of the twosecond carrier signals; and when dividing one input first carrieraggregation signal into two first carrier signals for outputting, theduplexer 2 further filters out spurious noise signals outside the bandsof the two first carrier signals.

FIG. 5 is a schematic structural diagram of Embodiment 4 of a radiofrequency transmit-receive apparatus according to the present invention.As shown in FIG. 5, a radio frequency transmit-receive apparatus 500 inthis embodiment, which is based on the embodiment of the radio frequencytransmit-receive apparatus shown in FIG. 4, may further include a secondantenna unit 6 and at least one surface acoustic wave filter (SAW) unit7.

The second antenna unit 6 may be configured to receive a third carrieraggregation signal, and input the third carrier aggregation signal tothe at least one SAW unit 7.

The at least one SAW unit 7 may be configured to receive the thirdcarrier aggregation signal input by the second antenna unit, and afterdividing the third carrier aggregation signal into at least one thirdcarrier signal, input the at least one third carrier signal to the radiofrequency unit 3. Specifically, when the third carrier aggregationsignal includes a signal of only one frequency band, the at least oneSAW unit 7 outputs one third carrier signal; and when the third carrieraggregation signal includes signals of two frequency bands, the at leastone SAW unit 7 outputs two third carrier signals.

The radio frequency unit 3 may be further configured to receive the atleast one third carrier signal input by the at least one SAW unit, anddemodulate each of the at least one third carrier signal into a thirdanalog baseband signal.

It should be noted that the second antenna unit 6 and the first antennaunit 1 receive a same signal, that is, the third carrier aggregationsignal and the first carrier aggregation signal are actually a samesignal. A receive status of the second antenna unit 6 keeps consistentwith that of the first antenna unit 1. For example, if the first antennareceives a signal of frequency band a, the second antenna also receivesthe signal of frequency band a; if the first antenna receives CA signalsof frequency bands a and b, the second antenna also receives CA signalsof frequency bands a and b.

Specifically, the second antenna unit 6, the SAW unit 7, and the radiofrequency unit 3 constitute a downlink channel used to receive the thirdcarrier aggregation signal. The downlink channel may be used as a backupof the downlink channel in the foregoing embodiments, and may enhancestrength of the second carrier aggregation signal received by the radiofrequency transmit-receive apparatus and improve reception performance.Usually the first antenna unit 1 may be called a main antenna, and thesecond antenna unit 6 may be called a diversity antenna.

In the radio frequency unit 3, there may be two radio frequency subunits31 respectively corresponding to carrier signals of two differentfrequency bands. Correspondingly, each of the at least one SAW unit 7may include two filters respectively corresponding to the two frequencybands, where the filters are configured to select two third carriersignals of respective bands from one input third carrier aggregationsignal. Furthermore, if an input port of a radio frequency subunit 31 inthe radio frequency unit 3 is a differential port, an output port of theSAW unit 7 may be set as a differential port, that is, when the thirdcarrier aggregation signal is divided into at least one third carriersignal of different frequencies, each third carrier signal is convertedinto a differential signal and then output to the corresponding radiofrequency subunit 31.

Further, each signal selecting subunit 41 of the signal selecting unit 4may further correspond to a differential component 8.

Each differential component 8 may be configured to receive one the atleast one first carrier signal input by a corresponding signal selectingsubunit 41, and after converting one of the at least one first carriersignal into a differential signal, input the differential signal to acorresponding radio frequency subunit 31 in the radio frequency unit 3.

The use of differential component 8 is to satisfy a scenario in which aradio frequency input interface of the radio frequency unit 3 is adifferential interface. If the radio frequency input interface of theradio frequency unit 3 is a single-end interface, no differentialcomponent needs to be disposed.

Further, each signal selecting unit 4 further corresponds to a poweramplifier 9.

Each power amplifier 9 may be configured to receive one of the at leastone second carrier signal input by the radio frequency unit 3, and afterperforming power amplification for one of the at least one secondcarrier signal, input one of the at least one second carrier signal to acorresponding signal selecting subunit 41.

The use of power amplifier 9 is driven by the concern that the at leastone second carrier signal generated by the radio frequency unit 3usually has low power. To ensure communication quality, the secondcarrier signal generated by each radio frequency subunit 31 in the radiofrequency unit 3 needs to be amplified by the power amplifier 9 beforeit is input to a corresponding signal selecting subunit 41.

In this embodiment, a second antenna unit receives a third carrieraggregation signal; an SAW unit performs wave filtering and frequencyselection, divides the second carrier aggregation signal into thirdcarrier signals of various frequency bands, and then inputs these thirdcarrier signals to a radio frequency unit corresponding to a frequencyband. In this way, an additional downlink channel is provided, andstrength of a downlink signal is enhanced, which ensures receptionperformance.

FIG. 6 is a schematic structural diagram of Embodiment 5 of a radiofrequency transmit-receive apparatus according to the present invention.As shown in FIG. 6, a radio frequency transmit-receive apparatus 600 inthis embodiment, which is based on the embodiment of the radio frequencytransmit-receive apparatus shown in FIG. 5, may further include: a firstsingle-pole N-throw (SPNT) switch 10, where the first SPNT switch 10 isdisposed between the first antenna unit 1 and the duplexer 2, and may beconfigured to receive the first carrier aggregation signal sent by thefirst antenna unit 1, and input the first carrier aggregation signal tothe duplexer 2; and may be further configured to receive the secondcarrier aggregation signal sent by the duplexer 2, and input the secondcarrier aggregation signal to the first antenna unit 1.

It should be noted that there may be two or more than two duplexers,where each duplexer 2 may correspond to at least two signal selectingsubunits 41. Alternatively, only one duplexer may be used. For example,the duplexer 2 is used to implement aggregation of two carrier signalsand if a single-carrier signal transmission channel needs to beadditionally provided, the first SPNT switch 10 may also be used toselect a transmission channel corresponding to the duplexer or asingle-carrier signal transmission channel.

Specifically, a primary function of the first SPNT switch 10 is toselect a duplexer from multiple duplexers 2, so that a transmissionchannel corresponding to the selected duplexer 2 is in a working state.Therefore, a single-pole N-throw switch may be used as the first SPNTswitch 10. Usually, two ports of each duplexer 2 may be respectivelyused for transmission of carrier signals of one frequency band, but eachpower amplifier 9 usually supports carrier signals of only one frequencyband. Therefore, multiple duplexers 2 and multiple power amplifiers 9may be used to constitute multiple transmission channels, and the firstSPNT switch 10 makes flexible selection among the multiple transmissionchannels, which therefore may satisfy a requirement of a user or anoperator on various frequency bands of the radio frequencytransmit-receive apparatus.

Further, the apparatus may further include a second SPNT switch 11,where the second SPNT switch 11 is disposed between the second antennaunit 6 and each SAW unit 7, and configured to receive the third carrieraggregation signal sent by the second antenna unit 6, and input thethird carrier aggregation signal to the SAW unit 7.

There may be multiple SAW units. Each SAW unit 7 usually can performwave filtering and frequency selection for signals of two frequencybands. Therefore, by using multiple SAW units 7 and using the secondSPNT switch 11 to make selection for carrier signals of differentfrequency bands corresponding to the multiple SAW units 7, a requirementof a user or operator on various frequency bands of the radio frequencytransmit-receive apparatus may be satisfied.

In a specific implementation, the first SPNT switch 10 and the secondSPNT switch 11 may also be controlled by a controlling unit 5.

It should be noted that in FIG. 6, to describe a connection relationshipbetween each component more clearly, multiple radio frequency subunits31 are illustrated. However, in an actual implementation, because radiofrequency signals of only two frequency bands are required in a sametimeslot, only two radio frequency subunits 31 may be actually used, andthey work in corresponding frequency bands according to different bandrequirements.

Apparently, if it is necessary to implement carrier aggregation of moredifferent frequency bands, a corresponding number of radio frequencysubunits 31 need to be used. For example, three radio frequency subunits31 may be used to implement carrier aggregation of three differentfrequency bands.

In this embodiment, multiple duplexers and transmission channelscorresponding to the duplexers are disposed, and a first SPNT switchmakes flexible selection among various transmission channels, so thatthe radio frequency transmit-receive apparatus in this embodiment maysupport carrier signals of more frequency bands.

FIG. 7 is a schematic structural diagram of Embodiment 1 of a terminalaccording to the present invention. As shown in FIG. 7, a terminal 700in this embodiment may include a baseband processor 701, and furtherinclude the radio frequency transmit-receive apparatus 702 according toany embodiment of the radio frequency transmit-receive apparatus in thepresent invention.

The radio frequency transmit-receive apparatus 702 is configured toreceive a first carrier aggregation signal, and after converting thefirst carrier aggregation signal into a first analog baseband signal,send the first analog baseband signal to the baseband processor 701; andthe baseband processor 701 is configured to process the first analogbaseband signal.

The baseband processor 701 is further configured to generate a secondanalog baseband signal, and send the second analog baseband signal tothe radio frequency transmit-receive apparatus 702; and the radiofrequency transmit-receive apparatus 702 is further configured toconvert the second analog baseband signal into a second carrieraggregation signal for transmission.

Due to the use of the radio frequency transmit-receive apparatusaccording to any one of the foregoing embodiments, the terminal in thisembodiment may perform flexible configuration of uplink and downlinkresources.

FIG. 8 is a flowchart of a radio frequency transmit-receive methodaccording to an embodiment of the present invention. This embodiment maybe executed by a signal selecting unit in a radio frequencytransmit-receive apparatus. The method specifically includes:

S801. Select to receive, in a TDD timeslot, a first carrier signal inputby a duplexer, where the first carrier signal is obtained by theduplexer by dividing a first carrier aggregation signal input by a firstantenna unit; and input the first carrier signal to a radio frequencyunit, so that the radio frequency unit demodulates the first carriersignal into a first analog baseband signal.

S802. Select to receive, in the TDD timeslot, at least one secondcarrier signal sent by the radio frequency unit, and send the at leastone second carrier signal to the duplexer, so that the duplexer combinesthe at least one second carrier signal to obtain a second carrieraggregation signal and the first antenna unit transmits the secondcarrier aggregation signal.

Further, in S801, the selecting to receive, in a TDD timeslot, a firstcarrier signal input by a duplexer, includes: selecting to receive, inthe TDD timeslot according to a set ratio of uplink signal resources todownlink signal resources, the first carrier signal input by theduplexer; and correspondingly, in S802, the selecting to receive, in theTDD timeslot, at least one second carrier signal sent by the radiofrequency unit, includes: selecting to receive, in the TDD timeslotaccording to the set ratio of uplink signal resources to downlink signalresources, the at least one second carrier signal sent by the radiofrequency unit.

As may be known from the apparatus embodiment corresponding to FIG. 4,the controlling unit in the radio frequency transmit-receive apparatusmay control, in the TDD timeslot according to the set resourceconfiguration of uplink signals and downlink signals, the signalselecting unit to select to receive the first carrier signal input bythe duplexer; and control, in the TDD timeslot, the signal selectingunit to select to receive the at least one second carrier signal sent bythe radio frequency unit and send the at least one second carrier signalto the duplexer. For details, reference may be made to the embodimentcorresponding to FIG. 4, and details are not described herein again.

In this embodiment, a signal selecting unit may select to receive, in aTDD timeslot, a downlink first carrier signal, and may further select totransmit, in the TDD timeslot, an uplink second carrier signal, therebyachieving an objective of using a frequency band of the first carriersignal for downlink reception and using a frequency band of the secondcarrier signal for uplink transmission, implementing flexibleconfiguration of uplink and downlink resources.

Persons of ordinary skill in the art may understand that all or a partof the steps of the method embodiments may be implemented by a programinstructing relevant hardware. The program may be stored in a computerreadable storage medium. When the program runs, the steps of the methodembodiments are performed. The foregoing storage medium includes anymedium that can store program code, such as a ROM, a RAM, a magneticdisk, or an optical disc.

Finally, it should be noted that the foregoing embodiments are merelyintended for describing the technical solutions of the present inventionother than limiting the present invention. Although the presentinvention is described in detail with reference to the foregoingembodiments, persons of ordinary skill in the art should understand thatthey may still make modifications to the technical solutions describedin the foregoing embodiments or make equivalent replacements to some orall technical features thereof, without departing from the scope of thetechnical solutions of the embodiments of the present invention.

What is claimed is:
 1. A radio frequency transmit-receive apparatus,comprising: a first antenna unit, configured to receive a first carrieraggregation signal, and to input the first carrier aggregation signal toa duplexer; the duplexer, configured to receive the first carrieraggregation signal from the first antenna unit, to divide the firstcarrier aggregation signal into first carrier signals, and to input eachof the first carrier signals to a signal selecting unit corresponding toa frequency band; the signal selecting unit, configured to select afirst channel to receive, in a time division duplex (TDD) timeslot, thefirst carrier signals from the duplexer, and to input the first carriersignals to a radio frequency unit; and the radio frequency unit,configured to receive the first carrier signals from the signalselecting unit, and to demodulate each of the first carrier signals intoa respective first analog baseband signal; wherein the radio frequencyunit is further configured to modulate second analog baseband signalsinto respective second carrier signals, and to send the second carriersignals to the signal selecting unit; wherein the signal selecting unitis further configured to select a second channel to receive, in the TDDtimeslot, the second carrier signals from the radio frequency unit, andto send the second carrier signals to the duplexer; wherein the duplexeris further configured to receive the second carrier signals from thesignal selecting unit, to combine the second carrier signals to obtain asecond carrier aggregation signal, and to input the second carrieraggregation signal to the first antenna unit; wherein the first antennaunit is further configured to receive the second carrier aggregationsignal from the duplexer, and to transmit the second carrier aggregationsignal; and wherein the apparatus further comprises; a control unit,configured to control, in the TDD timeslot according to a set ratio ofuplink signal resources to downlink signal resources, the signalselecting unit to select the first channel to receive the first carriersignals and to input the first carrier signals to the radio frequencyunit; and to control the signal selecting unit to select the secondchannel to receive the second carrier signals and to send the secondcarrier signals to the duplexer.
 2. The apparatus according to claim 1,wherein the signal selecting unit comprises multiple signal selectingsubunits, the radio frequency unit comprises multiple radio frequencysubunits, and each signal selecting subunit corresponds to one radiofrequency subunit; and wherein each signal selecting subunit isconfigured to select the first channel to receive, in the TDD timeslot,one of the first carrier signals from the duplexer, and to input the oneof the first carrier signals to a corresponding radio frequency subunit;and further configured to select the second channel to receive, in theTDD timeslot, one of the second carrier signals from a correspondingradio frequency subunit, and to send the one of the second carriersignals to the duplexer.
 3. The apparatus according to claim 2, whereinthe control unit is further configured to: control, in the TDD timeslotaccording to the set ratio of uplink signal resources to downlink signalresources, a part of the multiple signal selecting subunits to selectthe first channel to receive the first carrier signals from the duplexerand to input the first carrier signals to the radio frequency unit, andto control a part of the multiple signal selecting subunits to selectthe second channel to receive the second carrier signals from the radiofrequency unit and to send the second carrier signals to the duplexer.4. The apparatus according to claim 1, further comprising a secondantenna unit and at least one surface acoustic wave filter (SAW) unit,wherein: the second antenna unit is configured to receive a thirdcarrier aggregation signal, and to input the third carrier aggregationsignal to the at least one SAW unit; the at least one SAW unit isconfigured to receive the third carrier aggregation signal from thesecond antenna unit, to divide the third carrier aggregation signal intothird carrier signals, and to input the third carrier signals to theradio frequency unit; and the radio frequency unit is further configuredto receive the third carrier signals from the at least one SAW unit, andto demodulate each of the third carrier signals into a respective thirdanalog baseband signal.
 5. The apparatus according to claim 2, whereinthe multiple signal selecting subunits include a signal selectingsubunit corresponding to a differential component; and wherein thedifferential component is configured to receive one of the first carriersignals from the corresponding signal selecting subunit, to convert theone of the first carrier signals into a differential signal, and toinput the differential signal to a corresponding radio frequencysubunit.
 6. The apparatus according to claim 2, wherein the multiplesignal selecting subunits include a signal selecting subunitcorresponding to a power amplifier; and wherein the power amplifier isconfigured to receive one of the second carrier signals from acorresponding radio frequency subunit, to perform power amplificationfor the one of the second carrier signals, and to input thepower-amplified one of the second carrier signals to the signalselecting subunit corresponding to the power amplifier.
 7. The apparatusaccording to claim 4, further comprising: a single-pole N-throw (SPNT)switch, disposed between the first antenna unit and the duplexer,configured to receive the first carrier aggregation signal from thefirst antenna unit, to input the first carrier aggregation signal to theduplexer, to receive the second carrier aggregation signal from theduplexer, and to input the second carrier aggregation signal to thefirst antenna unit.
 8. The apparatus according to claim 4, furthercomprising: a single-pole N-throw (SPNT) switch, disposed between thesecond antenna unit and the at least one SAW unit, configured to receivethe third carrier aggregation signal from the second antenna unit, andto input the third carrier aggregation signal to the at least one SAWunit.
 9. The apparatus according to claim 1, wherein the duplexer isfurther configured to filter out noise signals outside one or more bandsin which the second carrier signals and first carrier signals arelocated.
 10. A terminal, comprising a baseband processor and a radiofrequency transmit-receive apparatus, wherein: the radio frequencytransmit-receive apparatus is configured to receive a first carrieraggregation signal, to convert the first carrier aggregation signal intoa first analog baseband signal, and to send the first analog basebandsignal to the baseband processor; the baseband processor is configuredto process the first analog baseband signal; the baseband processor isfurther configured to generate a second analog baseband signal, and tosend the second analog baseband signal to the radio frequencytransmit-receive apparatus; and the radio frequency transmit-receiveapparatus is further configured to convert the second analog basebandsignal into a second carrier aggregation signal for transmission; theradio frequency transmit-receive apparatus comprises: a first antennaunit, configured to receive the first carrier aggregation signal, and toinput the first carrier aggregation signal to a duplexer; the duplexer,configured to receive the first carrier aggregation signal from thefirst antenna unit, to divide the first carrier aggregation signal intofirst carrier signals, and to input each of the first carrier signals toa signal selecting unit corresponding to a frequency band; the signalselecting unit, configured to select a first channel to receive, in atime division duplex (TDD) timeslot, the first carrier signals from theduplexer, and to input the first carrier signals to a radio frequencyunit; and the radio frequency unit, configured to receive the firstcarrier signals from the signal selecting unit, and to demodulate eachof the first carrier signals into a respective first analog basebandsignal; wherein the radio frequency unit is further configured tomodulate the second analog baseband signal into a second carrier signal,and to send the second carrier signal to the signal selecting unit;wherein the signal selecting unit is further configured to select asecond channel to receive, in the TDD timeslot, the second carriersignal from the radio frequency unit, and to send the second carriersignal to the duplexer; wherein the duplexer is further configured toreceive the second carrier signal from the signal selecting unit, tocombine the second carrier signal with at least one other second carriersignal to obtain the second carrier aggregation signal, and to input thesecond carrier aggregation signal to the first antenna unit; and whereinthe first antenna unit is further configured to receive the secondcarrier aggregation signal from the duplexer, and transmit the secondcarrier aggregation signal.
 11. A radio frequency transmit-receivemethod, comprising: receiving, by a first antenna unit, a first carrieraggregation signal; obtaining, by a duplexer, first carrier signals bydividing the first carrier aggregation signal; selecting a first channelto receive, in a time division duplex (TDD) timeslot, the first carriersignals from the duplexer; inputting the first carrier signals to aradio frequency unit; demodulating, by the radio frequency unit, thefirst carrier signals into respective first analog baseband signals; andselecting a second channel to receive, in the TDD timeslot, secondcarrier signals from the radio frequency unit; sending the secondcarrier signals to the duplexer; combining, by the duplexer, the secondcarrier signals to obtain a second carrier aggregation signal; andtransmitting, by the first antenna unit, the second carrier aggregationsignal; wherein selecting the first channel to receive the first carriersignals is based on a set ratio of uplink signal resources to downlinksignal resources; and wherein selecting the second channel to receivethe second carrier signals is based on the set ratio of uplink signalresources to downlink signal resources.